Gently used flooring nail/staple gun. Bought it last summer and installed about 750 sqft of 3/4" hardwood flooring. Works great, just don't need it anymore. Save yourself some money, brand new it's $189. Alternatively, it costs $39/day or $156/week to rent a flooring nail gun from home depot. I'll throw an almost full box of 1.5 inch cleats as well.
Link to the exact model: